There are a couple of videos which seem to be pretty essential for optimizing your health. If you don’t have much time, then just quickly go through the second video (though you can skip the first 10 or 15 minutes, since they are mostly just self-promotion).
All about the latest conclusions from vitamin D research:
The Top Six Biohacks | Dave Asprey
Very dense and interesting presentation. Arguably you can’t see too much on the slides due to lighting, but what Dave says should give you enough of an idea.